Shaking-screen, &amp;c.



N0. 843,442. PATENTED PEB. 5, 1907. J. B. CORNWALL. SHAKING SCREEN, 65o.

APPLIOATION FILED MAR. 21, 1906.

2 SHEETS-SHEET 1.

EMM

W/TNESSES PATENTBD FEB. 5, 1907.

J. B. CORNWALL. SHAKING SCREEN, aw. APPLICATION FILED MAR. 21. 1906.

2 SHEETS-SHEET 2.

/NVENTOH ATTORNEYS W/TNESSES rus Nokms Erg-Rs con wunlNnroN. v. c.

Nnarran s'rnrns PATENT OFFICE.

JOHN B. COItNl/VALL, OF MOLINE, ILLINOIS, ASSIGNOR TO BARNARD AND LEASMANUFACTURING COMPANY, OF MOLINE, ILLINOIS.

SHAKING-SCREE NJ &0.

Specification of Letters Patent.

Patented Feb. 5, 1907.

To all whom, it may concer/fb.-

' Be it known that I, JOI-IN B. OoRNwALL, of Moline, in the county ofIock Island and State of Illinois, have invented certain new and usefulImprovements in Shaking-Screens, Sac.; and I hereby declare that thefollowing is a full, clear, and exact description thereof, refere cebeing had to the accompanying drawings, which form part of thisspecification.

This invention is an improvement in shaking screens, separators, sieves,and like machines in which the shaker-frame is to be reciprocated in asingle exact horizontal plane.

The invention consists substantially in the novel construction andconnections ofthe upstanding rocker-arms by which the shakerframe issupported, such arms being pivoted at their lower ends and having curvedrocker'- heads on their upper ends upon which the shaker-frame rests,said heads engaging pl ane-surfaced bearing-plates attached to theshaker-frame. The rocker-heads are kept from lateral displacement byside flanges and from longitudinal displacement relative to the shakerby means of connecting-rods each pivoted at one end to the shaker-frameand at the other end to a lug on the adjacent rocker-head, the centersof the pivots being in line with the contact-point of the rockerhead andbearing-plates.

The invention further includes novel means for steadying the movementand lessening jars on the shaker-frame, consisting in a novelarrangement of springs by which the reversals of movement are cushionedand the efficiency of the machine is increased.

The shaker-frame may be reciprocated longitudinally by eccentrics andconnectingrods. By the aforesaid means the shakingscreen can besupported and moved in one perfectly-level plane.

The invention will be more fully understood from the followingdescription of the machine illustrated in the accompanying drawings,which illustrate a paddy-rice separating-machine embodying theinvention, and the features and combinations of parts for whichprotection is desired are summarized in the claims.

In said drawings, Figure l is a side elevation of a complete machine.Fig. 2 is an enlarged side view of one of the supporting devices. Fig. 3is a front elevation of Fig. 2. Fig. 4t is a detail view showing theconnection between the springs and shaker-frame.

The screen or separator may be of any desired construction and kind forwhich a horizontal reciprocating motion is desired and is mounted upon alower shaker-frame A, to which are secured at four or more pointsbearing-plates B, which may be of cast-iron and preferably extendlongitudinally of the frame and are provided with side flanges l), beingdressed perfectly true between the flanges. The said bearing-plates restupon rocker-heads c on the upper ends of rocking arms or supports O,which are pivoted at their lower ends and can swing or rocklongitudinally of the shaker-frame. The upper edge of each rocker-head cis curved on an arc concentric with the axis of the pivot of the arm, sothat the shaker-frame A will be maintained in one uniform horizontalplane during its reciprocations.

The arms O, as shown, are arranged in pairs, and the adjacent arms ineach pair are mounted on rock-shafts D, journaled in boxes d, attachedto a suitable iixed base E. Each arm O is provided with aleterally-projecting bracket C on its ripper end, to which bracket ispivotally connected one end of a rod F by means of a stud-bolt c2passing through an eyef on the rod and engaging the bracket O, as shownin Figs. 2 and 3. The axis of the bolt cl is directly in line with thepoint of contact of the rocker-head c and the bearing-plate B when therocker-arm is in vertical position. The other end of rod F is connectedto an eyef, which engages a studbolt g on a bracket G, attached to theshakerframe so as to be immovable relatively to the bearing-plate B. Bythis means the upper part of each rocker-arm is so connected to theshaker-frame that while the arm can rock or swing thereunder it cannotbe displaced longitudinally thereof.

The rod F may be adjustably connected to the eyes ff by means ofscrew-threads and sockets and locking-nutsjg, so that the rocking armsmay be accurately adjusted relatively to the bearing-plates.

ICO

The rocker-arms are maintained in proper relative position to thebearing-plates and shaker-frame without any direct connection betweenthe arm and bearing-plates, although the arms are connected with theshaker-frame by the rods F.

With such parts properly constructed the shaker-frame can be easilyreciprocated longitudinally and will operate more smoothly and easilythan do machines wherein the rocking bearings are at the lower ends ofthe arm. Furthermore, there is less liability of lateral vibration ofthe shaker-frame and it is maintained in one exact horizontal plane atall parts of its stroke.

rIhe shaker-frame may be reciprocated by any suitable means. As shown inthe drawings, a rod H is pivotally connected at one end to a bracket lL,fastened to the frame A, and the other end of said rod is connected toan eccentric-strap i, engaging an eccentric i on a transversely-arrangedshaft I, Iiournaled in suitable supports adjacent the end of theshaker-frame.

In order to steady the action of the machine, lessen the shocks ofreversal, and hold the frame down upon rock-arms, I enploy springs J J,(see rigs. l and 4,) which are connected at their lower ends byshacklebolts to a bracket e, attached to the base E about centrally ofthe shaker-frame, and said springs extend upwardly in oppositedirections and are respectively connected by bolts J to brackets K,attached to the ends of the shaker-frame A. rIhe tension of the springsis regulable by adjusting-nuts j on bolts J. By this arrangement ofsprings the momentum of the shaker-frame will be overcome, close contactwill be maintained between the eccentric-strap and the eccentric, and aneasier running action is obtained.

The springs can be arranged at different angles to the shaker-frame, andone of their important functions is to hold down the frame upon therocker-arms as well as to cushion the reversals thereof. he nearer thesprings approach the perpendicular the stronger they must be, as theywill be less extended in the more inclined position.

The method of construction shown inv the Vdrawings produces a sznootherand more depivotally connected to the said arms and said frame toprevent longitudinal displacement of the arms.

2. In combination, upstanding rocker-arms pivcted at their lower endsand having their 'upper ends curved on arcs concentric with their pivotsa shaker-frame slpported upon the upper ends or heads of saidrocker-arms, and rods pivotally connected to the upper ends of said armsand to the shaker-frame.

3. In combination, upstanding rocker-arms pivoted at their lower endsand having heads on their upper ends curved on arcs concentric withtheir pivots; a shaker-frame sipported upon the said rocker-arms,bearing-plates attached to the under side of the shaker-frame andengaging the rocker-heads of the arms, and rods pivotally connected atone end to said arms and at the other end to a fixed point on the frame.

e. The combination of a base, a shakerframe, rocking arms supportingsaid frame, said arms being pivoted to the base and having a rockingconnection with the frame, and means for reciprocating said frame; withopposing inclined springs attached at their upper ends to the oppositeends of the frame exterior to the rocker-arms, and at their lower innerends secilred to fixed points on the base about centrally below theframe.

5. The combination of a shaker-frame, rocking arms pivoted at theirlower ends and having cnrved ipper ends supporting said frame, and meansfor reciprocating said frame 5 and rods pivotally connected at one endto said arms and at the other end to a fixed point on the frame; withopposing springs attached at their outer rpper ends to the opposite endsof the frame, and at their lower inner ends to fixed points below theshaker-frame.

6. In combination, a shaker-frame, upstanding rocker-arms pivoted attheir lower ends and having heads on their upper ends supporting saidframe; bearing-plates attached to the 'ander side of the shaker-frameand engaging the rocker-heads of the arms, and rods pivotally connectedat one end to said arms and at other end to iixed points on the frame;with springs connected to the base below the shaking-frame and extendingnpwardly and outwardly in opposite directions and having their upperends respectively connected to the opposite ends of the shakerframe.

7. In combination, upstanding rocker-arms pivoted at their lower endsand having their upper ends curved on arcs concentric with their pivotsa shaker-frame supported upon the upper ends of said rocker-arms, andbearing-plates attached to the under side of the shaker-frame andengaging the upper ends of the arms with rods pivotally connected at IIOIIS

one end to said arms and at other end to a I my own I a'Hix my Signaturein presence of 'iXed point on the ironie; and lsprings oontwo witnesses.nected at their lower ends to t 1e base and Y T .w T ,y having theirupper ends respectively Con- Jonk B' LORD ALL' 5 nected to the oppositeends of the shake'rt 1n presence offrame, and means for reciprocatingthe frame. C. D. NEAL,

In testimony that I claim the foregoing as i STEPHEN D. RAY.

